Enhancement - Split Screen in the IDE

It would be helpful if the Arduino IDE could have a "split-screen" capability, so we can see two areas of code at the same time - pretty much the same as you can do in MS Excel..

I find mysel constantly scrolling up and down to see what I have named things, for example. Having the ability to see 2 areas of code would be great.

The issue names no files or tests. Start by locating the Arduino IDE 1.x editor entry point and checking how its current code view is implemented. Done means users can view two separate areas of code simultaneously without losing their place, with the behavior documented or covered by the project's relevant tests.

Written by the indexing model from the issue text.